[#577] Fix sub-pixel gravity causing "bounciness" when drawing.
[#577] Fix sub-pixel gravity causing "bounciness" when drawing.

melonjs/melonJS,srbala/melonJS,gopalindians/melonJS,srbala/melonJS,gopalindians/melonJS,TukekeSoft/melonJS,TukekeSoft/melonJS,rlugojr/melonJS,MarkoIvanetic/melonJS,MarkoIvanetic/melonJS,rlugojr/melonJS,srbala/melonJS,melonjs/melonJS,TukekeSoft/melonJS,gopalindians/melonJS,rlugojr/melonJS